summaryrefslogtreecommitdiffstats
path: root/drivers/pci/hotplug/rpaphp_pci.c
blob: 46c157d26a2f9b90d6cfbe3d08fa1229c30a0d46 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
/*
 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <lxie@us.ibm.com>
 *
 */
#include <linux/pci.h>
#include <asm/pci-bridge.h>
#include <asm/rtas.h>
#include <asm/machdep.h>
#include "../pci.h"		/* for pci_add_new_bus */

#include "rpaphp.h"

static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
					struct device_node *dn)
{
	struct pci_bus *child = NULL;
	struct list_head *tmp;
	struct device_node *busdn;

	busdn = pci_bus_to_OF_node(bus);
	if (busdn == dn)
		return bus;

	list_for_each(tmp, &bus->children) {
		child = find_bus_among_children(pci_bus_b(tmp), dn);
		if (child)
			break;
	}
	return child;
}

struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn)
{
	struct pci_dn *pdn = dn->data;

	if (!pdn  || !pdn->phb || !pdn->phb->bus)
		return NULL;

	return find_bus_among_children(pdn->phb->bus, dn);
}
EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus);

int rpaphp_claim_resource(struct pci_dev *dev, int resource)
{
	struct resource *res = &dev->resource[resource];
	struct resource *root = pci_find_parent_resource(dev, res);
	char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
	int err = -EINVAL;

	if (root != NULL) {
		err = request_resource(root, res);
	}

	if (err) {
		err("PCI: %s region %d of %s %s [%lx:%lx]\n",
		    root ? "Address space collision on" :
		    "No parent found for",
		    resource, dtype, pci_name(dev), res->start, res->end);
	}
	return err;
}

EXPORT_SYMBOL_GPL(rpaphp_claim_resource);

static int rpaphp_get_sensor_state(struct slot *slot, int *state)
{
	int rc;
	int setlevel;

	rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);

	if (rc < 0) {
		if (rc == -EFAULT || rc == -EEXIST) {
			dbg("%s: slot must be power up to get sensor-state\n",
			    __FUNCTION__);

			/* some slots have to be powered up 
			 * before get-sensor will succeed.
			 */
			rc = rtas_set_power_level(slot->power_domain, POWER_ON,
						  &setlevel);
			if (rc < 0) {
				dbg("%s: power on slot[%s] failed rc=%d.\n",
				    __FUNCTION__, slot->name, rc);
			} else {
				rc = rtas_get_sensor(DR_ENTITY_SENSE,
						     slot->index, state);
			}
		} else if (rc == -ENODEV)
			info("%s: slot is unusable\n", __FUNCTION__);
		else
			err("%s failed to get sensor state\n", __FUNCTION__);
	}
	return rc;
}

/**
 * get_pci_adapter_status - get the status of a slot
 * 
 * 0-- slot is empty
 * 1-- adapter is configured
 * 2-- adapter is not configured
 * 3-- not valid
 */
int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
{
	struct pci_bus *bus;
	int state, rc;

	*value = NOT_VALID;
	rc = rpaphp_get_sensor_state(slot, &state);
	if (rc)
		goto exit;

 	if (state == EMPTY)
 		*value = EMPTY;
 	else if (state == PRESENT) {
		if (!is_init) {
			/* at run-time slot->state can be changed by */
			/* config/unconfig adapter */
			*value = slot->state;
		} else {
			bus = rpaphp_find_pci_bus(slot->dn);
			if (bus && !list_empty(&bus->devices))
				*value = CONFIGURED;
			else
				*value = NOT_CONFIGURED;
		}
	}
exit:
	return rc;
}

/* Must be called before pci_bus_add_devices */
static void 
rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		/*
		 * Skip already-present devices (which are on the
		 * global device list.)
		 */
		if (list_empty(&dev->global_list)) {
			int i;
			
			/* Need to setup IOMMU tables */
			ppc_md.iommu_dev_setup(dev);

			if(fix_bus)
				pcibios_fixup_device_resources(dev, bus);
			pci_read_irq_line(dev);
			for (i = 0; i < PCI_NUM_RESOURCES; i++) {
				struct resource *r = &dev->resource[i];

				if (r->parent || !r->start || !r->flags)
					continue;
				rpaphp_claim_resource(dev, i);
			}
		}
	}
}

static int rpaphp_pci_config_bridge(struct pci_dev *dev)
{
	u8 sec_busno;
	struct pci_bus *child_bus;
	struct pci_dev *child_dev;

	dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));

	/* get busno of downstream bus */
	pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
		
	/* add to children of PCI bridge dev->bus */
	child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
	if (!child_bus) {
		err("%s: could not add second bus\n", __FUNCTION__);
		return -EIO;
	}
	sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
	/* do pci_scan_child_bus */
	pci_scan_child_bus(child_bus);

	list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
		eeh_add_device_late(child_dev);
	}

	 /* fixup new pci devices without touching bus struct */
	rpaphp_fixup_new_pci_devices(child_bus, 0);

	/* Make the discovered devices available */
	pci_bus_add_devices(child_bus);
	return 0;
}

/*****************************************************************************
 rpaphp_pci_config_slot() will  configure all devices under the
 given slot->dn and return the the first pci_dev.
 *****************************************************************************/
static struct pci_dev *
rpaphp_pci_config_slot(struct pci_bus *bus)
{
	struct device_node *dn = pci_bus_to_OF_node(bus);
	struct pci_dev *dev = NULL;
	int slotno;
	int num;

	dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
	if (!dn || !dn->child)
		return NULL;

	slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);

	/* pci_scan_slot should find all children */
	num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
	if (num) {
		rpaphp_fixup_new_pci_devices(bus, 1);
		pci_bus_add_devices(bus);
	}
	if (list_empty(&bus->devices)) {
		err("%s: No new device found\n", __FUNCTION__);
		return NULL;
	}
	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
			rpaphp_pci_config_bridge(dev);
	}

	return dev;
}

static void enable_eeh(struct device_node *dn)
{
	struct device_node *sib;

	for (sib = dn->child; sib; sib = sib->sibling) 
		enable_eeh(sib);
	eeh_add_device_early(dn);
	return;
	
}

static void print_slot_pci_funcs(struct pci_bus *bus)
{
	struct device_node *dn;
	struct pci_dev *dev;

	dn = pci_bus_to_OF_node(bus);
	if (!dn)
		return;

	dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
	list_for_each_entry (dev, &bus->devices, bus_list)
		dbg("\t%s\n", pci_name(dev));
	return;
}

int rpaphp_config_pci_adapter(struct pci_bus *bus)
{
	struct device_node *dn = pci_bus_to_OF_node(bus);
	struct pci_dev *dev;
	int rc = -ENODEV;

	dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
	if (!dn)
		goto exit;

	enable_eeh(dn);
	dev = rpaphp_pci_config_slot(bus);
	if (!dev) {
		err("%s: can't find any devices.\n", __FUNCTION__);
		goto exit;
	}
	print_slot_pci_funcs(bus);
	rc = 0;
exit:
	dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
	return rc;
}
EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);

static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
{
	eeh_remove_device(dev);
	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
		struct pci_bus *bus = dev->subordinate;
		struct list_head *ln;
		if (!bus)
			return; 
		for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
			struct pci_dev *pdev = pci_dev_b(ln);
			if (pdev)
				rpaphp_eeh_remove_bus_device(pdev);
		}

	}
	return;
}

int rpaphp_unconfig_pci_adapter(struct pci_bus *bus)
{
	struct pci_dev *dev, *tmp;

	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
		rpaphp_eeh_remove_bus_device(dev);
		pci_remove_bus_device(dev);
	}
	return 0;
}

static int setup_pci_hotplug_slot_info(struct slot *slot)
{
	dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
	    __FUNCTION__);
	rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
	rpaphp_get_pci_adapter_status(slot, 1,
				      &slot->hotplug_slot->info->
				      adapter_status);
	if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
		err("%s: NOT_VALID: skip dn->full_name=%s\n",
		    __FUNCTION__, slot->dn->full_name);
		return -EINVAL;
	}
	return 0;
}

static void set_slot_name(struct slot *slot)
{
	struct pci_bus *bus = slot->bus;
	struct pci_dev *bridge;

	bridge = bus->self;
	if (bridge)
		strcpy(slot->name, pci_name(bridge));
	else
		sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
			bus->number);
}

static int setup_pci_slot(struct slot *slot)
{
	struct device_node *dn = slot->dn;
	struct pci_bus *bus;

	BUG_ON(!dn);
	bus = rpaphp_find_pci_bus(dn);
	if (!bus) {
		err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
		goto exit_rc;
	}

	slot->bus = bus;
	slot->pci_devs = &bus->devices;
	set_slot_name(slot);

	/* find slot's pci_dev if it's not empty */
	if (slot->hotplug_slot->info->adapter_status == EMPTY) {
		slot->state = EMPTY;	/* slot is empty */
	} else {
		/* slot is occupied */
		if (!dn->child) {
			/* non-empty slot has to have child */
			err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 
				__FUNCTION__, slot->name);
			goto exit_rc;
		}

		if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
			dbg("%s CONFIGURING pci adapter in slot[%s]\n",  
				__FUNCTION__, slot->name);
			if (rpaphp_config_pci_adapter(slot->bus)) {
				err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
				goto exit_rc;		
			}

		} else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
			err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
				__FUNCTION__, slot->name);
			goto exit_rc;
		}
		print_slot_pci_funcs(slot->bus);
		if (!list_empty(slot->pci_devs)) {
			slot->state = CONFIGURED;
		} else {
			/* DLPAR add as opposed to 
		 	 * boot time */
			slot->state = NOT_CONFIGURED;
		}
	}
	return 0;
exit_rc:
	dealloc_slot_struct(slot);
	return -EINVAL;
}

int register_pci_slot(struct slot *slot)
{
	int rc = -EINVAL;

	if (setup_pci_hotplug_slot_info(slot))
		goto exit_rc;
	if (setup_pci_slot(slot))
		goto exit_rc;
	rc = register_slot(slot);
exit_rc:
	return rc;
}

int rpaphp_enable_pci_slot(struct slot *slot)
{
	int retval = 0, state;

	retval = rpaphp_get_sensor_state(slot, &state);
	if (retval)
		goto exit;
	dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
	/* if slot is not empty, enable the adapter */
	if (state == PRESENT) {
		dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
		retval = rpaphp_config_pci_adapter(slot->bus);
		if (!retval) {
			slot->state = CONFIGURED;
			dbg("%s: PCI devices in slot[%s] has been configured\n", 
				__FUNCTION__, slot->name);
		} else {
			slot->state = NOT_CONFIGURED;
			dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
			    __FUNCTION__, slot->name);
		}
	} else if (state == EMPTY) {
		dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
		slot->state = EMPTY;
	} else {
		err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
		    slot->name);
		slot->state = NOT_VALID;
		retval = -EINVAL;
	}
exit:
	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
	return retval;
}
OpenPOWER on IntegriCloud